1 /*- 2 * Copyright (c) 2013 Andre Oppermann <andre@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote 14 * products derived from this software without specific prior written 15 * permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $OpenBSD: siphash.h,v 1.4 2022/12/27 07:44:56 jmc Exp $ 30 */ 31 32 /* 33 * SipHash is a family of pseudorandom functions (a.k.a. keyed hash functions) 34 * optimized for speed on short messages returning a 64bit hash/digest value. 35 * 36 * The number of rounds is defined during the initialization: 37 * SipHash24_Init() for the fast and reasonable strong version 38 * SipHash48_Init() for the strong version (half as fast) 39 * 40 * struct SIPHASH_CTX ctx; 41 * SipHash24_Init(&ctx); 42 * SipHash_SetKey(&ctx, "16bytes long key"); 43 * SipHash_Update(&ctx, pointer_to_string, length_of_string); 44 * SipHash_Final(output, &ctx); 45 */ 46 47 #ifndef _SIPHASH_H_ 48 #define _SIPHASH_H_ 49 50 #define SIPHASH_BLOCK_LENGTH 8 51 #define SIPHASH_KEY_LENGTH 16 52 #define SIPHASH_DIGEST_LENGTH 8 53 54 typedef struct _SIPHASH_CTX { 55 uint64_t v[4]; 56 uint8_t buf[SIPHASH_BLOCK_LENGTH]; 57 uint32_t bytes; 58 } SIPHASH_CTX; 59 60 typedef struct { 61 uint64_t k0; 62 uint64_t k1; 63 } SIPHASH_KEY; 64 65 void SipHash_Init(SIPHASH_CTX *, const SIPHASH_KEY *); 66 void SipHash_Update(SIPHASH_CTX *, int, int, const void *, size_t); 67 uint64_t SipHash_End(SIPHASH_CTX *, int, int); 68 void SipHash_Final(void *, SIPHASH_CTX *, int, int); 69 uint64_t SipHash(const SIPHASH_KEY *, int, int, const void *, size_t); 70 71 #define SipHash24_Init(_c, _k) SipHash_Init((_c), (_k)) 72 #define SipHash24_Update(_c, _p, _l) SipHash_Update((_c), 2, 4, (_p), (_l)) 73 #define SipHash24_End(_d) SipHash_End((_d), 2, 4) 74 #define SipHash24_Final(_d, _c) SipHash_Final((_d), (_c), 2, 4) 75 #define SipHash24(_k, _p, _l) SipHash((_k), 2, 4, (_p), (_l)) 76 77 #define SipHash48_Init(_c, _k) SipHash_Init((_c), (_k)) 78 #define SipHash48_Update(_c, _p, _l) SipHash_Update((_c), 4, 8, (_p), (_l)) 79 #define SipHash48_End(_d) SipHash_End((_d), 4, 8) 80 #define SipHash48_Final(_d, _c) SipHash_Final((_d), (_c), 4, 8) 81 #define SipHash48(_k, _p, _l) SipHash((_k), 4, 8, (_p), (_l)) 82 83 #endif /* _SIPHASH_H_ */ 84